Lawn-mower-sharpening tool



April s 1924.

B. FVGARDNER ET AL.

LAWN MOWER SHARPENING T OQL FiledvJuly 21. 1922 2 sheets-sheet. 1

April 8 192.4. 1,489,492

B. F. GARDNER ET Ai.

LAWN MOWER SHARPENING TOOL Filed July 2l, 1922 2 Sheets-Sheet 2 Patented Apr. 8, 1924.

UNITEDA STAT is', RATENT OFFICE.

BENJAMIN FRR GARDNER "ANDDEWRY G. GARDNER, or WALL DARE,V IOWA.

LAWN-MoWER-SHARPENING TOQL.

Application :nea vrJ'uiy 21,

To all whom 'it may concern:

Be it known that we, BENJAMIN F. GARDNER and DEWEY Gr. GARDNER, citizens of the United States of America, and residents of fall Lake, Sac County, Iowa, have invented a new and useful Lawn-Mower- Sharpening Tool, of which the followinglis a specification. 1 Y

An object of this invention is to provide lan improved construction fory a hand tool adapt-, ed to be employed for sharpening the cutting blades of lawn mower reels.

A further object of this invention is to provide means for supporting and guidinga tool in reciprocation longitudinally of a cute ter blade. l Y

A further object of this invention is to provide means for adjusting a tool angularly relative to a Vcutter blade. therebydetermining the angle of a bevel formed by the tooll on said blade. .i

Our invention consists in the construction, arrangement and combination of elements hereinafter set forth, pointed out vin our claims and illustrated by the accompanying' drawing, in which.- Figure 1 is an elevation, partly in section,

showing our improved tool mounted onaY lawn mowerin positionfor practical luse, Figure 2 is a plan of the tool shown. in elcvation in .Figure 1. Figure 3 is a crosssection on the indicated line 3-3 ofFigure Figures L1, 5 and 6 areperspective, plan and side elevation respectively of a modified form of tool. v l;

In the construction of the device as shown in Figures 1, 2 and 3 the numeral 10 designates generally a frame preferably formed'-v of a single pieceof'round wire recurved on its central portion to form a U-shaped handle member 11 having relatively long armsarranged parallel with each other. Each arm of the frame is bent upwardly substantially midway ,of its length and each portion so .i bent upwardly is recurved on its central portion and has its terminal arm-.extended across theplane of the handle member, wherebyY twin arches 12, 13 are produced, cach arch being of substantially inverted U-shape and said arches being parallel. y Ahead 14v is mounted within and extends `transversely of both arches 12, 13 and a bolt 15 extends transversely of said head between said arches and is provided with a wing-nut 16. on oueend. Clamp members 17, 18 are mounted on the end portions of the bolt 15 and extend 1922. seria1 No. 576,466.

across extreme outer faces ofthe arches 12,

13. Each clamp member preferably is' formed l of* a single"length'` of round wire looped vabout thebolt` 15 andhaving itsfend portions extended longitudinally of and parallelY with the "verticah sides of the head 14, said Vend 'p'ortions extending' across -f the arms of the arches opposite to the? adjacent faces'of said head. Thus" provision is made for 'removing'an'd replacing the head' 14 con-v veniently relative to the arches by' loosening Vthe-lclam-ping effect ofthe bolt 15 and turn* ing the `clampingmember 17 into aposition aft right ,angles `to that-shown wherebyY Vit may'passoff and-between the arches in any vertical movement v of the head'- relative tothe arches. The head 14 vpreferably is made of wood andy guide yokes V19,120 are mounted thereon and project therefrom within or adjacent .to the bases of the rarches 12, 13. Each guide yokeprefer'ably is formed of aesingle length of round wire recurved on its central portion tojform a guide seat 21 and re- 1 curved in thegopposi'te direction at the eX-4 form legs 22,223; the end portionsof vthe legs being 'bent'at rightlangles-to the bodies thereof and driven into end portions of the headA 14. VThus Y provision l' is'made for slidingly resting andV mounting one Vendportion ofthe tool von-a l'connect-ing rod -24'ofza lawn mower, lsaid lawn mowerbeing illustratedin part and conventionally in Figureell, thetool being adapted -for manual'slidinglmovement on said rod and longitudinally thereof. An

abrading ,implement Y '25, L- whichV may be formedlof ashort section of'aflat file of well extend across and engage the upper surface,

of the handle 11. T ightening of the stove bolts26, 27 results in a'clamping effect on the abrading relement*whereby it is held tightlyto the handle. The clamping members 28,29 are substantial duplicates of the members 17, 18`anfd engage the stove bolts by theirflooped'centersand the arms of the handle llwfb'y their laterally extended end S0 tremities 'of the arms ofthe guide seat to v loo l.

portions. By the use offthe `clamping devices as shown the abrading element'25 may be adjusted longitudinally of the handle member 11 properly to bridge the space between the rod 2/1 and the cutter' blade 30 on a lawn mower reel 31. l the abrading element 25 may be adjusted angularly relative to the handle member 11 to accommodate it to a helical formation of cutter .blade commonly found f inlawn mowers.

In practical use the lawn mower is supported or suspended in such manner thatits traction wheels, one of which is shown in f Figure 1 and indicated vby the lnumeralrg2,

are free to rotatein,eitherdirectiom .thereby releasing the reel .31 and cutter :blades thereon from control because `of thegearing commonly found between the reel andtrac-` Thereupon the sharpeningftool.

tion wheels. is mounted as illustrated 1n Figure 1 loosely on the rod 24 and in contact withthe bev-l eled margin of a cutter blade 30 Vand is inanually operated to and fro longitudinally of the rod and blade. Thernuts of thestove bolts 26, 27 serve as guides to confine-the marginal portion of :the cutter blade yand effect an oscillation of the reel so vthat although the abrading element25 is movedin a right line the beveled face :of .theblade may be abraded, ground or reduced uniformly to produce a cutting edge at the acute angle thereof; Theseveral blades on the reel may be treated in turn by rotary adjustment of the reel to bring themsuccessively within the range of operation .of lthe tool.

In the construction of the tool as illustrated in Figures 1,.5 and 6 a frame-10 is formed of a single pieceof barmetal having a handle member 11 compassing substantially one-half the length of thebar .and formed with a longitudinal slot 11. The remainder of the bar is bent upwardly and recurved at its central lportionto form an arch 12 and each larm ofthe arch is formed A,

with a longitudinal slot 12 .or .12 guide member 19, preferably made of archedmetal, is arranged within. and `transversely of the arch 12 andis formed with an ear 19 rising from its convex surface and apertured in registry with the slots 12', 12. A bolt 15 is mounted loosely through the slots 12, 12 and the holeiin theear 19 and a wingnut 16 isvmounted on the forward end of said bolt and maybe employed to clamp the arms of the arch rigidly to the guide member 19. Thus provision is made for adjusting the guide member 19 in and locking it to the arch 12. An `abrading element 25 is mounted transversely of and beneath the handle 11 and stove bolts 26, 27 are mounted through the groove 11 on opposite sides of the element. Flanged nuts 33, 34 are employedlon'the stoveb'olts By the same meansl gaging the lower face of and serving to level the nuts with the abrading element.

The device illustrated in Figures l, 5 and 6 is usable and adjustable substantially in the same manner as the device above described in connection with Figures 1, 2 and 3 and is to be considered a modification thereof.

live claim as our invention- I1. A'lawn-mower sharpening tool, comprisinga suitableframe formed with an integral arch at one end, a guide head mounted adjustably in said arch and adapted for sliding engagement V.with a suitable support, and an abradingelement mounted on said frame and v spaced from said head and adapted for engagement with an object to beabraded.

2. lawn-mower sharpening tool, comprising a slotted frame formed with an integ'r'al arch at one end perpendicular to the body of the frame, a guide head mountedl frame and 'spaced from said head and I adapted for engagement with an object 'to beabraded, vsaidabrading ielement extending across and Abeing adjustable longitudinally of the slot in said frame.

3. A lawn-mower sharpeningtool, comprising a suitable frame having a longitu dinal slot in its =body and formed with an integral arch kat one end, the walls of said arch being formed with registering slots, a guide head mounted in said arch and adapted for sliding engagement with a suitable support, a clamping bolt extending through the slots of the archand also extending through said guide-head, and an abrading element mounted. on said frame and spaced yfromsaid head and adapted for engagementfwith ,an object to be abraded,

saidiabrading element being adjustable longitudinally'and angularly of said frame.

l1/A lawn-mowersharpening tool, comprising a suitable frame formed with an arch` at `one end, ,a concaved guide head mounted between the walls of said arch and adapted for sliding engagement with a suitable support, and an abrading element mounted on `said .frame and spaced from said head and'adapted for engagement with an object to be abraded, said guide head being adjustable laterally of said frame wholly within and guided by said arch.

Signed at .Wall Lake, Vin the county of SacVand State Yof, Iowa, this 21st day of April, 1922. i i

,. BENJAMIN FRK GARDNER,

G. GARDNER. 

